style: manual UI tweaks (users/companies headers, wider layout, user-view, projects index)

User's manual changes: header slots with New-user/New-company actions, wider
max-w-7xl containers on /admin/users and /companies, plus tweaks to
user-view and projects index views. All views compile.

Co-Authored-By: Claude Opus 4.8 (1M context) <noreply@anthropic.com>

resources/views/projects/index.blade.php

@@ -13,7 +13,7 @@
         </div>
     </x-slot>
 
-    <div class="py-8">
+    <div class="py-12">
         <div class="max-w-7xl mx-auto sm:px-6 lg:px-8">
             @if(session('success'))
                 <div class="alert alert-success mb-4 shadow">
@@ -21,7 +21,7 @@
                 </div>
             @endif
 
-            <div class="bg-white rounded-xl shadow">
+            <div class="bg-white rounded-xl shadow p-6">
                 <livewire:project-table />
             </div>
         </div>